@misc{indiciaef1d2fc4fef96,
  title = {Traveling-wave maser, closed cycle refrigerator automation},
  author = {Mcneil, J. A. and Petty, S. M.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19820003421},
  note = {Source identifier: 19820003421}
}